National Dex
Defeat the Elite Four. Leave your house after the credits complete and Professor Juniper's father will upgrade your Pokedex to the National Dex.

Alternate Trainer Card colors
Complete the indicated task to unlock the coresponding color.
Black or White: Complete the National Pokedex.
Gold: Obtain all Pokemon Musical Items.
Purple: Defeat the Elite 4.
Red: Get a 49 Streak in both Super Single and Super Double Subway lines in the
Battle Subway.
Silver: Obtain all Entralink Powers.

Wallpapers
Defeat the Elite Four to unlock a new set of wallpapers. Defeat them again to unlock another set of wallpapers.

Birthday bonuses
* Set the system date to your birthday. Talk to the nurse at a Pokemon Center and she will ask if it is your birthday. Answer "Yes" and she will wish you a happy birthday.
* Set the system date to your birthday. Go to the Pokemon Musical and talk to the owner upstairs to get the birthday cake prop.

Hold items
The following items can be found at the indicated locations.
Amulet Coin: Unite the three dancers in Castelia City. Defeat first one by the fountain and he will ask you to find two other dancers. They are found on Narrow Street and on a Unity Pier. Fight them and then talk to them afterwards. Return to the fountain and talk to the dancer in the middle to get the Amulet Coin, which increases the money you gain.
Big Root: Found in Pinwheel Forest or 5% chance from a wild Lileep or Cradily. This item increases the HP that results from successful Energy draining moves (for example, Leech Seed).
Black Sludge: Has a 5% chance from a wild Trubbish, Croagunk, or Toxicroak or 50% chance from a wild Garbodor. This item restores 1/16th of a Poison-type Pokemon's HP every turn. It damages other types when held.
Health Wig: Defeat the fourth gym leader then begin to cross Charizard Bridge. Toward the middle is a shadowy black dot floating on the ground. Step on top of it to get the Health Wig, which increases the base health level of a Pokemon.
Experience Share: Given to you by the CEO/Janitor of the Battle Company on the Floor 55 in Castelia City.
Leftovers: Found in a garbage can under the Village Bridge between Route 11 and Route 12. The Dousing Machine must be used to find it. This item restores 1/16th of a Pokemon's health every turn.
Lucky Egg: Given to you by Professor Juniper when you arrive at Chargestone Cave on Route 6. This item gives extra experience points to the Pokemon holding it in any battle it participates in.
Macho Brace: Found in Nimbasa City, from a man standing at the eastern gate. This item will doubles the EV points the Pokemon gets in battle but will halves its speed stat.
Scope Lens: Found on Floor 47 in the Battle Company in Castelia City. This item boosts a Pokemon's critical hit ratio.
Power Hold items: Purchased at the Battle Subway.
Power Weight: +4 HP EV points after every battle, 50% speed stat.
Power Bracer: +4 Attack EV points after every battle, 50% speed stat.
Power Belt: +4 Defense EV points after every battle, 50% speed stat.
Power Lens: +4 Special Attack EV points after every battle, 50% speed stat.
Power Band: +4 Special Defense EV points after every battle, 50% speed stat.
Power Anklet: +4 HP EV points after every battle, 50% speed stat.

Relocator option
Go to the second floor of the building with the scientist that wants a password at Castelia City. Talk to him, then say "Everyone Happy" then "Simple Connection". Save the game. You can now use the "Relocator" option at the main menu to transfer the Legendary Trio (Raikou, Suicune and Entei) and Celebi to Pokemon Black or White.

Easy experience
After defeating the Elite 4, go to the Giant Chasm with two Blisseys in the back of your party. After encountering the Ditto, send in Blissey. Let the Ditto transform into Blissey, then switch out and defeat the fake Blissey for easy experience.

Unity Tower
Unity Tower is located in the oceans of Unova. To access it, do an international trade using the Geonet. You then now travel to Unity Tower by getting on the boat at the Unity Pier at Castelia City. The Unity Tower tracks people from different countries available on the Geonet. You may talk to these people and track things about them.

Changing Pokemon
Complete the indicated task to change forms.
Arceus: Give a plate to Arceus to have it change form.
Deerling or Sawsbuck: Deerling or Sawsbuck will change into their Spring, Summer, Fall, Winter forms depending on the current season based on the system time.
Deoxys: Examine the meteor in the museum in Nacrene to cycle through Deoxys' Normal, Attack, Defense, and Speed forms
Eevee: Fight enemies near the moss-covered stone in Pinwheel Forest to evolve into Leafeon. Fight enemies near the frozen ice crystal at the bottom of Twist Mountain to evolve into Glaceon
Feebas: Trade Feebas while it is holding a Prism Scale (obtained on Route 13) to evolve into Milotic.
Giratina: Give Giratina a Griseous Orb from the Shadow Triad on the Marvelous Bridge to change into its Origin form.
Karrablast and Shelmet: To evolve Karrablast and Shelmet, trade one for the other with another player. The Karrablast will evolve into Escavalier and the Shelmet will evolve into Accelgor.
Magneton: Fight enemies in Chargestone Cave to evolve into Magnezone.
Nosepass : Fight enemies in Chargestone Cave to evolve into Probopass.
Rotom: Open the boxes in the first door on Floor 1 of the Shopping Mall Nine to change into Rotom's Normal, Heat, Wash, Frost, Fan, and Mow forms.
Shaymin: Give a Gracidea (from the woman in the Pokemon Center in Lacunosa Town) to Shaymin to change it into its Sky form.

Audino
Walk over to shaking patches of tall grass to have a chance to encounter Audino. Note: Use Repel in grass to find shaking patches easier.

Victini
Using the Nintendo WiFi connection, get the Mystery Gift (the Liberty Pass) from the main menu before April 10, 2011. Use the Liberty Pass to catch Victini in the dungeon of the tower at Liberty Garden.

if you cannot download trainer then go to Chrome/Firefox's settings, specifically to the Privacy settings and simply unchecking the "Enable phishing and malware protection" option.

Some Game Trainers are sometimes reported to be a Virus or Trojan,
the most common is a keylogger called HotKeysHook or the file
has been packed/protected with VMProtect or Themida and
is recognized as Win32/Packed.VMProtect or Win32/Packed.Themida.
In ALL cases this is a FALSE ALARM as NONE
of the Game Trainers @ GCW contain known malicious code! More info in
the PC
Games FAQ!